Scilab Function
Last update : Mai 1999

global - Define global variable

### Calling Sequence

  `global('nam1',...,'namn')`
  `global nam1 ... namn`

### Parameters

- `nam1,..., namn`: valid variable names

### Description

Ordinarily, each Scilab function, has its own local variables and can "read" all variables created in the base workspace or by the calling functions. The `global` keyword allow to make variables read/write across functions. Any assignment to that variable, in any function, is available to all the other functions declaring it `global`.

If the global variable doesn't exist the first time you issue the `global` statement, it will be initialized to the empty matrix.

### Examples

    //first: calling environnment and a function share a variable
    global a
    a=1
    deff('y=f1(x)','global a,a=x^2,y=a^2')
    f1(2)
    a
    //second: three functions share variables
    deff('initdata()','global A C ;A=10,C=30')
    deff('letsgo()','global A C ;disp(A) ;C=70')
    deff('letsgo1()','global C ;disp(C)')
    initdata()
    letsgo()
    letsgo1()

### See Also

`who`, `isglobal`, `clearglobal`, `gstacksize`, `resume`,